CVE-2025-39735 (GCVE-0-2025-39735)
Vulnerability from cvelistv5 – Published: 2025-04-18 07:01 – Updated: 2026-08-05 12:04
VLAI
EPSS
VEX
Title
jfs: fix slab-out-of-bounds read in ea_get()
Summary
In the Linux kernel, the following vulnerability has been resolved:
jfs: fix slab-out-of-bounds read in ea_get()
During the "size_check" label in ea_get(), the code checks if the extended
attribute list (xattr) size matches ea_size. If not, it logs
"ea_get: invalid extended attribute" and calls print_hex_dump().
Here, EALIST_SIZE(ea_buf->xattr) returns 4110417968, which exceeds
INT_MAX (2,147,483,647). Then ea_size is clamped:
int size = clamp_t(int, ea_size, 0, EALIST_SIZE(ea_buf->xattr));
Although clamp_t aims to bound ea_size between 0 and 4110417968, the upper
limit is treated as an int, causing an overflow above 2^31 - 1. This leads
"size" to wrap around and become negative (-184549328).
The "size" is then passed to print_hex_dump() (called "len" in
print_hex_dump()), it is passed as type size_t (an unsigned
type), this is then stored inside a variable called
"int remaining", which is then assigned to "int linelen" which
is then passed to hex_dump_to_buffer(). In print_hex_dump()
the for loop, iterates through 0 to len-1, where len is
18446744073525002176, calling hex_dump_to_buffer()
on each iteration:
for (i = 0; i < len; i += rowsize) {
linelen = min(remaining, rowsize);
remaining -= rowsize;
hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
linebuf, sizeof(linebuf), ascii);
...
}
The expected stopping condition (i < len) is effectively broken
since len is corrupted and very large. This eventually leads to
the "ptr+i" being passed to hex_dump_to_buffer() to get closer
to the end of the actual bounds of "ptr", eventually an out of
bounds access is done in hex_dump_to_buffer() in the following
for loop:
for (j = 0; j < len; j++) {
if (linebuflen < lx + 2)
goto overflow2;
ch = ptr[j];
...
}
To fix this we should validate "EALIST_SIZE(ea_buf->xattr)"
before it is utilised.
Severity
7.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 16:13 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
11 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
6e39b681d1eb16f408493bf5023788b57f68998c , < 3d6fd5b9c6acbc005e53d0211c7381f566babec1
(git)
Affected: bbf3f1fd8a0ac7df1db36a9b9e923041a14369f2 , < 50afcee7011155933d8d5e8832f52eeee018cfd3 (git) Affected: 27a93c45e16ac25a0e2b5e5668e2d1beca56a478 , < 78c9cbde8880ec02d864c166bcb4fe989ce1d95f (git) Affected: 9c356fc32a4480a2c0e537a05f2a8617633ddad0 , < 46e2c031aa59ea65128991cbca474bd5c0c2ecdb (git) Affected: 9353cdf28d4c5c0ff19c5df7fbf81ea774de43a4 , < a8c31808925b11393a6601f534bb63bac5366bab (git) Affected: 8c505ebeed8045b488b2e60b516c752b851f8437 , < 0beddc2a3f9b9cf7d8887973041e36c2d0fa3652 (git) Affected: d9f9d96136cba8fedd647d2c024342ce090133c2 , < 16d3d36436492aa248b2d8045e75585ebcc2f34d (git) Affected: d9f9d96136cba8fedd647d2c024342ce090133c2 , < 5263822558a8a7c0d0248d5679c2dcf4d5cda61f (git) Affected: d9f9d96136cba8fedd647d2c024342ce090133c2 , < fdf480da5837c23b146c4743c18de97202fcab37 (git) Affected: 4ea25fa8747fb8b1e5a11d87b852023ecf7ae420 (git) Affected: 676a787048aafd4d1b38a522b05a9cc77e1b0a33 (git) Affected: 5.4.287 , < 5.4.292 (semver) Affected: 5.10.231 , < 5.10.236 (semver) Affected: 5.15.174 , < 5.15.180 (semver) Affected: 6.1.120 , < 6.1.134 (semver) Affected: 6.6.64 , < 6.6.87 (semver) Affected: 6.12.2 , < 6.12.23 (semver) Affected: 4.19.325 , < 4.20 (semver) Affected: 6.11.11 , < 6.12 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.13
Unaffected: 0 , < 6.13 (semver) Unaffected: 5.4.292 , ≤ 5.4.* (semver) Unaffected: 5.10.236 , ≤ 5.10.* (semver) Unaffected: 5.15.180 , ≤ 5.15.* (semver) Unaffected: 6.1.134 , ≤ 6.1.* (semver) Unaffected: 6.6.87 , ≤ 6.6.* (semver) Unaffected: 6.12.23 , ≤ 6.12.* (semver) Unaffected: 6.13.11 , ≤ 6.13.* (semver) Unaffected: 6.14.2 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix) |
guessed |
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix slab-out-of-bounds read in ea_get()\n\nDuring the \"size_check\" label in ea_get(), the code checks if the extended\nattribute list (xattr) size matches ea_size. If not, it logs\n\"ea_get: invalid extended attribute\" and calls print_hex_dump().\n\nHere, EALIST_SIZE(ea_buf-\u003exattr) returns 4110417968, which exceeds\nINT_MAX (2,147,483,647). Then ea_size is clamped:\n\n\tint size = clamp_t(int, ea_size, 0, EALIST_SIZE(ea_buf-\u003exattr));\n\nAlthough clamp_t aims to bound ea_size between 0 and 4110417968, the upper\nlimit is treated as an int, causing an overflow above 2^31 - 1. This leads\n\"size\" to wrap around and become negative (-184549328).\n\nThe \"size\" is then passed to print_hex_dump() (called \"len\" in\nprint_hex_dump()), it is passed as type size_t (an unsigned\ntype), this is then stored inside a variable called\n\"int remaining\", which is then assigned to \"int linelen\" which\nis then passed to hex_dump_to_buffer(). In print_hex_dump()\nthe for loop, iterates through 0 to len-1, where len is\n18446744073525002176, calling hex_dump_to_buffer()\non each iteration:\n\n\tfor (i = 0; i \u003c len; i += rowsize) {\n\t\tlinelen = min(remaining, rowsize);\n\t\tremaining -= rowsize;\n\n\t\thex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,\n\t\t\t\t linebuf, sizeof(linebuf), ascii);\n\n\t\t...\n\t}\n\nThe expected stopping condition (i \u003c len) is effectively broken\nsince len is corrupted and very large. This eventually leads to\nthe \"ptr+i\" being passed to hex_dump_to_buffer() to get closer\nto the end of the actual bounds of \"ptr\", eventually an out of\nbounds access is done in hex_dump_to_buffer() in the following\nfor loop:\n\n\tfor (j = 0; j \u003c len; j++) {\n\t\t\tif (linebuflen \u003c lx + 2)\n\t\t\t\tgoto overflow2;\n\t\t\tch = ptr[j];\n\t\t...\n\t}\n\nTo fix this we should validate \"EALIST_SIZE(ea_buf-\u003exattr)\"\nbefore it is utilised."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - JFS is a block-device filesystem (FS_REQUIRES_DEV); the malicious `size` field must arrive via a locally attached/mounted volume, and the trigger is a local syscall (listxattr/getxattr/setxattr) or an ACL lookup on a file in that volume. There is no network-facing path to `ea_get()`.\nAC:L - The attacker fully and deterministically controls the on-disk `jfs_ea_list.size` field; setting it above INT_MAX guarantees the negative clamp on every access, with no race to win and no dependence on memory layout the attacker cannot influence.\nPR:L - `ea_get()` runs before any permission or name check in `__jfs_getxattr`/`jfs_listxattr`, and is reached from `jfs_get_acl()` during ordinary permission checks, so an unprivileged user with read/search access to the mounted crafted volume triggers it; in the auto-mount/kiosk scenario the equivalent unprivileged-attacker framing PR:N/UI:R yields the same score.\nUI:N - Once the crafted volume is mounted (attacker-inserted removable media auto-mounted by udisks2, or an admin-mounted untrusted image), no victim action is required \u2014 the attacker\u0027s own `listxattr()`/`getxattr()` call, or even a path-traversal ACL lookup, reaches the bug directly.\nS:U - The out-of-bounds reads and the resulting oops are confined to the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The corrupted length drives an effectively unbounded walk past (and before) the ea buffer, hex-dumping 16 bytes of adjacent kernel heap memory per iteration \u2014 together with kernel addresses \u2014 into the kernel log; this is a large-scale kernel memory disclosure, not a small bounded read.\nI:N - The defect is read-only: `hex_dump_to_buffer()` clamps its per-line length to rowsize and bounds-checks `linebuf` at every byte, so no out-of-bounds write or memory corruption occurs and no control-flow primitive is produced.\nA:H - The loop performs billions of `printk` iterations (console livelock, soft lockup, RCU stalls, log flooding) and inevitably dereferences an unmapped kernel address, producing a KASAN report or page-fault oops/panic."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:04:55.584Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"references": [
{
"url": "https://git.kernel.org/stable/c/3d6fd5b9c6acbc005e53d0211c7381f566babec1"
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"url": "https://git.kernel.org/stable/c/50afcee7011155933d8d5e8832f52eeee018cfd3"
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"url": "https://git.kernel.org/stable/c/78c9cbde8880ec02d864c166bcb4fe989ce1d95f"
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"url": "https://git.kernel.org/stable/c/a8c31808925b11393a6601f534bb63bac5366bab"
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{
"url": "https://git.kernel.org/stable/c/0beddc2a3f9b9cf7d8887973041e36c2d0fa3652"
},
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"url": "https://git.kernel.org/stable/c/16d3d36436492aa248b2d8045e75585ebcc2f34d"
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},
{
"url": "https://git.kernel.org/stable/c/fdf480da5837c23b146c4743c18de97202fcab37"
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],
"title": "jfs: fix slab-out-of-bounds read in ea_get()",
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"datePublished": "2025-04-18T07:01:36.453Z",
"dateReserved": "2025-04-16T07:20:57.119Z",
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"state": "PUBLISHED"
},
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"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-39735",
"date": "2026-09-15",
"epss": "0.00294",
"percentile": "0.21916"
},
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"current_release_date": "2026-02-21T03:53:27.000Z",
"cve": "CVE-2025-39735",
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"initial_release_date": "2025-04-02T00:00:00.000Z",
"product_status:known_not_affected": "3",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "jfs: fix slab-out-of-bounds read in ea_get()",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-39735.json",
"version": "3"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2025-39735\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-18T07:15:44.150\",\"lastModified\":\"2026-06-17T09:18:22.470\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\njfs: fix slab-out-of-bounds read in ea_get()\\n\\nDuring the \\\"size_check\\\" label in ea_get(), the code checks if the extended\\nattribute list (xattr) size matches ea_size. If not, it logs\\n\\\"ea_get: invalid extended attribute\\\" and calls print_hex_dump().\\n\\nHere, EALIST_SIZE(ea_buf-\u003exattr) returns 4110417968, which exceeds\\nINT_MAX (2,147,483,647). Then ea_size is clamped:\\n\\n\\tint size = clamp_t(int, ea_size, 0, EALIST_SIZE(ea_buf-\u003exattr));\\n\\nAlthough clamp_t aims to bound ea_size between 0 and 4110417968, the upper\\nlimit is treated as an int, causing an overflow above 2^31 - 1. This leads\\n\\\"size\\\" to wrap around and become negative (-184549328).\\n\\nThe \\\"size\\\" is then passed to print_hex_dump() (called \\\"len\\\" in\\nprint_hex_dump()), it is passed as type size_t (an unsigned\\ntype), this is then stored inside a variable called\\n\\\"int remaining\\\", which is then assigned to \\\"int linelen\\\" which\\nis then passed to hex_dump_to_buffer(). In print_hex_dump()\\nthe for loop, iterates through 0 to len-1, where len is\\n18446744073525002176, calling hex_dump_to_buffer()\\non each iteration:\\n\\n\\tfor (i = 0; i \u003c len; i += rowsize) {\\n\\t\\tlinelen = min(remaining, rowsize);\\n\\t\\tremaining -= rowsize;\\n\\n\\t\\thex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,\\n\\t\\t\\t\\t linebuf, sizeof(linebuf), ascii);\\n\\n\\t\\t...\\n\\t}\\n\\nThe expected stopping condition (i \u003c len) is effectively broken\\nsince len is corrupted and very large. This eventually leads to\\nthe \\\"ptr+i\\\" being passed to hex_dump_to_buffer() to get closer\\nto the end of the actual bounds of \\\"ptr\\\", eventually an out of\\nbounds access is done in hex_dump_to_buffer() in the following\\nfor loop:\\n\\n\\tfor (j = 0; j \u003c len; j++) {\\n\\t\\t\\tif (linebuflen \u003c lx + 2)\\n\\t\\t\\t\\tgoto overflow2;\\n\\t\\t\\tch = ptr[j];\\n\\t\\t...\\n\\t}\\n\\nTo fix this we should validate \\\"EALIST_SIZE(ea_buf-\u003exattr)\\\"\\nbefore it is utilised.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: jfs: correcci\u00f3n de lectura fuera de los l\u00edmites de slab en ea_get(). Durante la etiqueta \\\"size_check\\\" en ea_get(), el c\u00f3digo comprueba si el tama\u00f1o de la lista de atributos extendidos (xattr) coincide con ea_size. De lo contrario, registra \\\"ea_get: atributo extendido no v\u00e1lido\\\" y llama a print_hex_dump(). En este caso, EALIST_SIZE(ea_buf-\u0026gt;xattr) devuelve 4110417968, que excede INT_MAX (2147483647). A continuaci\u00f3n, se fija ea_size: int size = clamp_t(int, ea_size, 0, EALIST_SIZE(ea_buf-\u0026gt;xattr)); Aunque clamp_t busca limitar ea_size entre 0 y 4110417968, el l\u00edmite superior se trata como un entero, lo que provoca un desbordamiento por encima de 2^31 - 1. Esto hace que \\\"size\\\" se repita y se vuelva negativo (-184549328). El \\\"size\\\" se pasa a print_hex_dump() (llamado \\\"len\\\" en print_hex_dump()) como tipo size_t (un tipo sin signo). Este se almacena en una variable llamada \\\"int remaining\\\", que se asigna a \\\"int linelen\\\", que a su vez se pasa a hex_dump_to_buffer(). En print_hex_dump(), el bucle for itera desde 0 hasta len-1, donde len es 18446744073525002176 y llama a hex_dump_to_buffer() en cada iteraci\u00f3n: for (i = 0; i \u0026lt; len; i += rowsize) { linelen = min(remaining, rowsize); remaining -= rowsize; hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize, linebuf, sizeof(linebuf), ascii); ... } La condici\u00f3n de detenci\u00f3n esperada (i \u0026lt; len) se rompe efectivamente ya que len est\u00e1 da\u00f1ado y es muy grande. Esto eventualmente lleva a que \\\"ptr+i\\\" se pase a hex_dump_to_buffer() para acercarse al final de los l\u00edmites reales de \\\"ptr\\\", eventualmente se realiza un acceso fuera de los l\u00edmites en hex_dump_to_buffer() en el siguiente bucle for: for (j = 0; j \u0026lt; len; j++) { if (linebuflen \u0026lt; lx + 2) goto overflow2; ch = ptr[j]; ... } Para solucionar esto debemos validar \\\"EALIST_SIZE(ea_buf-\u0026gt;xattr)\\\" antes de utilizarlo.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/jfs/xattr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6e39b681d1eb16f408493bf5023788b57f68998c\",\"lessThan\":\"3d6fd5b9c6acbc005e53d0211c7381f566babec1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bbf3f1fd8a0ac7df1db36a9b9e923041a14369f2\",\"lessThan\":\"50afcee7011155933d8d5e8832f52eeee018cfd3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"27a93c45e16ac25a0e2b5e5668e2d1beca56a478\",\"lessThan\":\"78c9cbde8880ec02d864c166bcb4fe989ce1d95f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9c356fc32a4480a2c0e537a05f2a8617633ddad0\",\"lessThan\":\"46e2c031aa59ea65128991cbca474bd5c0c2ecdb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9353cdf28d4c5c0ff19c5df7fbf81ea774de43a4\",\"lessThan\":\"a8c31808925b11393a6601f534bb63bac5366bab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8c505ebeed8045b488b2e60b516c752b851f8437\",\"lessThan\":\"0beddc2a3f9b9cf7d8887973041e36c2d0fa3652\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d9f9d96136cba8fedd647d2c024342ce090133c2\",\"lessThan\":\"16d3d36436492aa248b2d8045e75585ebcc2f34d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d9f9d96136cba8fedd647d2c024342ce090133c2\",\"lessThan\":\"5263822558a8a7c0d0248d5679c2dcf4d5cda61f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d9f9d96136cba8fedd647d2c024342ce090133c2\",\"lessThan\":\"fdf480da5837c23b146c4743c18de97202fcab37\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4ea25fa8747fb8b1e5a11d87b852023ecf7ae420\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"676a787048aafd4d1b38a522b05a9cc77e1b0a33\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.4.287\",\"lessThan\":\"5.4.292\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.10.231\",\"lessThan\":\"5.10.236\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.174\",\"lessThan\":\"5.15.180\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.120\",\"lessThan\":\"6.1.134\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.64\",\"lessThan\":\"6.6.87\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.2\",\"lessThan\":\"6.12.23\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.19.325\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.11.11\",\"lessThan\":\"6.12\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/jfs/xattr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.292\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.236\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.180\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.134\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.87\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.23\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13.11\",\"lessThanOrEqual\":\"6.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14.2\",\"lessThanOrEqual\":\"6.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userIntera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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T01:19:09+00:00",
"cve": "CVE-2025-39735",
"id": "CVE-2025-39735",
"initial_release_date": "2025-04-18T00:00:00+00:00",
"product_status:known_affected": "14",
"product_status:known_not_affected": "260",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: jfs: fix slab-out-of-bounds read in ea_get()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39735.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-03T00:13:57Z",
"cve": "CVE-2025-39735",
"id": "CVE-2025-39735",
"initial_release_date": "2025-04-18T23:18:59Z",
"product_status:known_affected": "376",
"product_status:known_not_affected": "423",
"product_status:recommended": "29",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-39735",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39735.json",
"version": "35"
},
"vulnrichment": {
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\"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T16:13:35.286674Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T14:42:03.710Z\"}}], \"cna\": {\"title\": \"jfs: fix slab-out-of-bounds read in ea_get()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.1, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\"}}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6e39b681d1eb16f408493bf5023788b57f68998c\", \"lessThan\": \"3d6fd5b9c6acbc005e53d0211c7381f566babec1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bbf3f1fd8a0ac7df1db36a9b9e923041a14369f2\", \"lessThan\": \"50afcee7011155933d8d5e8832f52eeee018cfd3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"27a93c45e16ac25a0e2b5e5668e2d1beca56a478\", \"lessThan\": \"78c9cbde8880ec02d864c166bcb4fe989ce1d95f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9c356fc32a4480a2c0e537a05f2a8617633ddad0\", \"lessThan\": \"46e2c031aa59ea65128991cbca474bd5c0c2ecdb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9353cdf28d4c5c0ff19c5df7fbf81ea774de43a4\", \"lessThan\": \"a8c31808925b11393a6601f534bb63bac5366bab\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8c505ebeed8045b488b2e60b516c752b851f8437\", \"lessThan\": \"0beddc2a3f9b9cf7d8887973041e36c2d0fa3652\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d9f9d96136cba8fedd647d2c024342ce090133c2\", \"lessThan\": \"16d3d36436492aa248b2d8045e75585ebcc2f34d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d9f9d96136cba8fedd647d2c024342ce090133c2\", \"lessThan\": \"5263822558a8a7c0d0248d5679c2dcf4d5cda61f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d9f9d96136cba8fedd647d2c024342ce090133c2\", \"lessThan\": \"fdf480da5837c23b146c4743c18de97202fcab37\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4ea25fa8747fb8b1e5a11d87b852023ecf7ae420\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"676a787048aafd4d1b38a522b05a9cc77e1b0a33\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.4.287\", \"lessThan\": \"5.4.292\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.10.231\", \"lessThan\": \"5.10.236\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.15.174\", \"lessThan\": \"5.15.180\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.1.120\", \"lessThan\": \"6.1.134\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.6.64\", \"lessThan\": \"6.6.87\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.12.2\", \"lessThan\": \"6.12.23\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.19.325\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.11.11\", \"lessThan\": \"6.12\", \"versionType\": \"semver\"}], \"programFiles\": [\"fs/jfs/xattr.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.292\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.236\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.180\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.134\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.87\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.23\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.14.*\"}, {\"status\": \"unaffected\", \"version\": \"6.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/jfs/xattr.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3d6fd5b9c6acbc005e53d0211c7381f566babec1\"}, {\"url\": \"https://git.kernel.org/stable/c/50afcee7011155933d8d5e8832f52eeee018cfd3\"}, {\"url\": \"https://git.kernel.org/stable/c/78c9cbde8880ec02d864c166bcb4fe989ce1d95f\"}, {\"url\": \"https://git.kernel.org/stable/c/46e2c031aa59ea65128991cbca474bd5c0c2ecdb\"}, {\"url\": \"https://git.kernel.org/stable/c/a8c31808925b11393a6601f534bb63bac5366bab\"}, {\"url\": \"https://git.kernel.org/stable/c/0beddc2a3f9b9cf7d8887973041e36c2d0fa3652\"}, {\"url\": \"https://git.kernel.org/stable/c/16d3d36436492aa248b2d8045e75585ebcc2f34d\"}, {\"url\": \"https://git.kernel.org/stable/c/5263822558a8a7c0d0248d5679c2dcf4d5cda61f\"}, {\"url\": \"https://git.kernel.org/stable/c/fdf480da5837c23b146c4743c18de97202fcab37\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\njfs: fix slab-out-of-bounds read in ea_get()\\n\\nDuring the \\\"size_check\\\" label in ea_get(), the code checks if the extended\\nattribute list (xattr) size matches ea_size. If not, it logs\\n\\\"ea_get: invalid extended attribute\\\" and calls print_hex_dump().\\n\\nHere, EALIST_SIZE(ea_buf-\u003exattr) returns 4110417968, which exceeds\\nINT_MAX (2,147,483,647). Then ea_size is clamped:\\n\\n\\tint size = clamp_t(int, ea_size, 0, EALIST_SIZE(ea_buf-\u003exattr));\\n\\nAlthough clamp_t aims to bound ea_size between 0 and 4110417968, the upper\\nlimit is treated as an int, causing an overflow above 2^31 - 1. This leads\\n\\\"size\\\" to wrap around and become negative (-184549328).\\n\\nThe \\\"size\\\" is then passed to print_hex_dump() (called \\\"len\\\" in\\nprint_hex_dump()), it is passed as type size_t (an unsigned\\ntype), this is then stored inside a variable called\\n\\\"int remaining\\\", which is then assigned to \\\"int linelen\\\" which\\nis then passed to hex_dump_to_buffer(). In print_hex_dump()\\nthe for loop, iterates through 0 to len-1, where len is\\n18446744073525002176, calling hex_dump_to_buffer()\\non each iteration:\\n\\n\\tfor (i = 0; i \u003c len; i += rowsize) {\\n\\t\\tlinelen = min(remaining, rowsize);\\n\\t\\tremaining -= rowsize;\\n\\n\\t\\thex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,\\n\\t\\t\\t\\t linebuf, sizeof(linebuf), ascii);\\n\\n\\t\\t...\\n\\t}\\n\\nThe expected stopping condition (i \u003c len) is effectively broken\\nsince len is corrupted and very large. This eventually leads to\\nthe \\\"ptr+i\\\" being passed to hex_dump_to_buffer() to get closer\\nto the end of the actual bounds of \\\"ptr\\\", eventually an out of\\nbounds access is done in hex_dump_to_buffer() in the following\\nfor loop:\\n\\n\\tfor (j = 0; j \u003c len; j++) {\\n\\t\\t\\tif (linebuflen \u003c lx + 2)\\n\\t\\t\\t\\tgoto overflow2;\\n\\t\\t\\tch = ptr[j];\\n\\t\\t...\\n\\t}\\n\\nTo fix this we should validate \\\"EALIST_SIZE(ea_buf-\u003exattr)\\\"\\nbefore it is utilised.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.292\", \"versionStartIncluding\": \"5.4.287\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.236\", \"versionStartIncluding\": \"5.10.231\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.180\", \"versionStartIncluding\": \"5.15.174\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.134\", \"versionStartIncluding\": \"6.1.120\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.87\", \"versionStartIncluding\": \"6.6.64\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.23\", \"versionStartIncluding\": \"6.12.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.11\", \"versionStartIncluding\": \"6.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14.2\", \"versionStartIncluding\": \"6.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15\", \"versionStartIncluding\": \"6.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.325\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.11.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-07-30T05:57:17.211Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2025-39735\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-30T05:57:17.211Z\", \"dateReserved\": \"2025-04-16T07:20:57.119Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-18T07:01:36.453Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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